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21 Dec 2009

Volume 95, Issue 25, Articles (25xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 95, 251105 (2009); http://dx.doi.org/10.1063/1.3275666 (3 pages)

D. Stehr, C. M. Morris, D. Talbayev, M. Wagner, H. C. Kim, A. J. Taylor, H. Schneider, P. M. Petroff, and M. S. Sherwin
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Localization of a breathing crack using nonlinear subharmonic response signals

F. Semperlotti, K. W. Wang, and E. C. Smith

Appl. Phys. Lett. 95, 254101 (2009); http://dx.doi.org/10.1063/1.3275705 (3 pages) | Cited 6 times

Online Publication Date: 21 December 2009

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The experimental validation of a structural health monitoring system based on the peculiar nonlinear dynamic response of cracked structures is proposed in this letter. The higher order harmonic response signal is a technique which allows detecting the location of a breathing crack taking advantage of the nonlinear dynamic response proper of a cracked structure. The experimental results show that information carried by the nonlinear harmonics allow detecting the structural damage without requiring a baseline signal of the healthy structure.
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89.20.Kk Engineering
62.20.mt Cracks
62.30.+d Mechanical and elastic waves; vibrations
81.40.Np Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure

To grate a liquid into tiny droplets by its impact on a hydrophobic microgrid

P. Brunet, F. Lapierre, F. Zoueshtiagh, V. Thomy, and A. Merlen

Appl. Phys. Lett. 95, 254102 (2009); http://dx.doi.org/10.1063/1.3275709 (3 pages) | Cited 2 times

Online Publication Date: 21 December 2009

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We report on experiments of drop impacting a hydrophobic microgrid of typical spacing a few tens of micrometers. Above a threshold in impact speed, liquid emerges to the other side, forming microdroplets of size about that of the grid holes. We propose a method to produce either a monodisperse spray or a single tiny droplet of volume as small as a few picolitres corresponding to a volume division of the liquid drop by a factor of up to 105. We also discuss the discrepancy of the measured thresholds with that predicted by a balance between inertia and capillarity.
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47.55.db Drop and bubble formation

Integrated acoustic and magnetic separation in microfluidic channels

Jonathan D. Adams, Patrick Thévoz, Henrik Bruus, and H. Tom Soh

Appl. Phys. Lett. 95, 254103 (2009); http://dx.doi.org/10.1063/1.3275577 (3 pages) | Cited 16 times

Online Publication Date: 21 December 2009

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With a growing number of cell-based biotechnological applications, there is a need for particle separation systems capable of multiparameter separations at high purity and throughput, beyond what is presently offered by traditional methods including fluorescence activated cell sorting and column-based magnetic separation. Toward this aim, we report on the integration of microfluidic acoustic and magnetic separation in a monolithic device for multiparameter particle separation. Using our device, we demonstrate high-purity separation of a multicomponent particle mixture at a throughput of up to 108 particles/hr.
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87.17.Uv Biotechnology of cell processes
43.25.Gf Standing waves; resonance

Electrically reconfigurable optical metamaterial based on colloidal dispersion of metal nanorods in dielectric fluid

Andrii B. Golovin and Oleg D. Lavrentovich

Appl. Phys. Lett. 95, 254104 (2009); http://dx.doi.org/10.1063/1.3278442 (3 pages) | Cited 6 times

Online Publication Date: 23 December 2009

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Optical metamaterials capture the imagination with breathtaking promises of nanoscale resolution in imaging and invisibility cloaking. We demonstrate an approach to construct a metamaterial in which metallic nanorods, of dimension much smaller than the wavelength of light, are suspended in a fluid and placed in a nonuniform electric field. The field controls the spatial distribution and orientation of nanorods because of the dielectrophoretic effect. The field-controlled placement of nanorods causes optical effects such as varying refractive index, optical anisotropy (birefringence), and reduced visibility of an object enclosed by the metamaterial.
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81.05.Xj Metamaterials for chiral, bianisotropic and other complex media
78.67.Qa Nanorods
42.70.-a Optical materials
78.20.-e Optical properties of bulk materials and thin films
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